package com.emo.cloudEdge.config;

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 自定义拦截器
 */
@Component
public class MyInterceptor implements HandlerInterceptor{
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //System.out.println("前置运行----a1");
        //返回值为false将拦截原始处理器的运行
        //如果配置多拦截器，返回值为false将终止当前拦截器后面配置的拦截器的运行
        System.out.println(handler);

        /**
         * 设置编码格式
         */
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");

        /**
         * 设置允许跨域
         */
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, PUT");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Requested-With");
        response.setHeader("Access-Control-Allow-Credentials", "true");

        return true;
    }

    //处理器运行之后执行
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        /*System.out.println("后置运行----b1");
        System.out.println(handler);
        System.out.println(modelAndView);*/
    }

    //所有拦截器的后置执行全部结束后，执行该操作
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        /*System.out.println("完成运行----c1");
        System.out.println(handler);
        System.out.println(ex);*/
    }

}
